Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b35f1fe272a679…

MALICIOUS

PDF

78.8 KB Created: 2021-07-31 04:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf6e40be10e04cc99d27c02804189222 SHA-1: cef869a7d3d6819c08c00baa7727dbdcf0a44791 SHA-256: 09b35f1fe272a679a4b77cd368e7979371904f02925ff6776b1ca03872256d7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=john+deere+sabre+parts+manual PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b907f37422d---wafixedifaluguzinij.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160927ffb6172c---xetaduzowakis.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/48203146992.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944e357a8b2---54591453252.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1780d14c79---92059657639.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ahred15uo1aelcl3mk4qtgabs0/5906528756.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/83412013363.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/bogevijuninexiwojatugete.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2077a51011---pukevixemizukera.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/54125945159.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/450926e677062f5efec5c90a6249a540/pevadejanovusosevaxat.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/53497826886.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce053dad6d---lozifazopu.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/38888425505.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/34450523856.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/jadafefefebegum.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/7536175520.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kisobalowafanukavifif.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/90698773551.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/69991891504.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd645fbb15f---19741822912.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb956dba089---gubikarevanazos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 16316 bytes
SHA-256: 929b8ceba2e3b3e363453ff9bc721861534da62377c43ae12fff57675d289c01
font_01_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 10796 bytes
SHA-256: 12b01c9b08aac97cc3cfdcd00bf40d198d15d431e38f8accb968cf919ba38a94

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